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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs $ 79 $ 610 $ 62   $ 175 $ 783  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)             $ 62
Building Solutions North America Retail [Member]              
Restructuring Cost and Reserve [Line Items]              
Goodwill, Impairment Loss             424
2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs   $ 610   $ 111     297
Payments for Restructuring         (64)   (95)
Restructuring Reserve, Settled without Cash             (96)
Currency Translation         1   2
Restructuring Reserve 45       45   108
Employee Severance | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             196
Payments for Restructuring         (62)   (92)
Restructuring Reserve, Settled without Cash             0
Currency Translation         1   2
Restructuring Reserve 45       45   106
Long-Lived Asset Impairment | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             96
Payments for Restructuring         0   0
Restructuring Reserve, Settled without Cash             (96)
Currency Translation         0   0
Restructuring Reserve 0       0   0
Other Restructuring | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             5
Payments for Restructuring         (2)   (3)
Restructuring Reserve, Settled without Cash             0
Currency Translation         0   0
Restructuring Reserve $ 0       $ 0   2
Global Products | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             136
Building Solutions North America | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             64
Building Solutions Asia Pacific | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             49
Building Solutions EMEA/LA | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             43
Corporate Segment | 2020 Restructuring Plan              
Restructuring Cost and Reserve [Line Items]              
Restructuring and impairment costs             $ 5